CORRECTED VERSION — This corrects the earlier story. County staff collected a sample of lake water Wednesday and sent it to a King County lab. The earlier version of the story erroneously said that a sample sent to the lab was taken by a county resident and given to officials.

FORKS — While it's not exactly swimming weather, Clallam County environmental health officials are cautioning West End residents to keep themselves and their pets out of 492-acre Lake Pleasant until tests can be done on what is thought to be blue-green algae.

All three produce the potentially deadly anatoxin-a, while microcystis also can produce microcystin, which can cause skin irritation and nausea over the short term and liver damage if ingested over a long period of time.

Fishing lake

Lake Pleasant is located about eight miles northeast of Forks, along U.S. Highway 101. It has a a year-round open fishing season for trout and kokanee.

About a week ago, Brastad received a phone call from a sheriff's deputy who was asking about a greenish substance in Lake Pleasant.

“We were suspecting that someone might have been dumping something,” Brastad said.

“Yesterday, we were given a sample of the water out there and started checking into it.”

Clallam County environmental health officials have heard no reports of other county lakes affected by algae.

Until the Lake Pleasant lab results are returned, Clallam County will use Jefferson County Public Health guidelines for low-level toxic algae blooms.

The recommendations are do not swim in areas of scum, do not drink lake water, keep pets and livestock away, clean fish well and discard guts and avoid scum when boating.